[datatable-help] A[B]?

[Rguy]

In the FAQ, the X[Y] syntax is first mentioned in item 1.11, where it is not
explained and no example of its use is provided.

In item 1.12, X[Y] is compared to merge, again without any attempt to
explain what X[Y] is or does, and with no examples of its use. Also, merge
is not discussed correctly:

"...the number of rows returned by merge(X,Y) and merge(Y,X) is the same."

This can be controlled by the merge arguments by.x, by.y.

I suggest that before discussing the in's and out's of the X[Y] syntax the
FAQ explain what it is and provide examples of its use. Think of it as "X[Y]
for Dummies". As things stand the  FAQ are completely useless for getting a
grip on X[Y] and it is very frustrating to encounter explanations of a
concept that has nowhere been introduced or illustrated.



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